Terms of use

Number Sums is offered free of charge for personal use. You may play as much as you like, share links to the site and share your results.

Please do not copy, resell or republish the site, its puzzles or its design without permission, and do not try to disrupt the service.

The site is provided as is, without any warranty. We may change or stop parts of it at any time. Saved progress lives in your browser and can be lost if you clear your browser data.

Last updated: October 2026.